Complex Boolean Statement Parser

BooleanParser.kt

fun analyze(statement: String) : Boolean {
    var string = statement
    if(statement.contains('(')){
        var start = 0
        var end = statement.length - 1
        for ((index, letter) in statement.toCharArray().withIndex()) {
            if(letter == '(') {
                start = index
                break
            }
        }
        val array = statement.toCharArray()
        while(end != 0){
            if(array[end] == ')')
                break
            end--
        }

        string = statement.substring(0, start) + analyze(statement.substring(start + 1, end)) + statement.substring(end + 1)
    }

    while(string.contains("!")) {
        string = string.replaceAll("!true", "false")
        string = string.replaceAll("!false", "true")
    }

    while(string.contains("||")) {
        string = string.replaceAll("true||false", "true")
        string = string.replaceAll("false||true", "true")
        string = string.replaceAll("true||true", "true")
        string = string.replaceAll("false||false", "false")
    }

    while(string.contains("&&")) {
        string = string.replaceAll("true&&false", "false")
        string = string.replaceAll("false&&true", "false")
        string = string.replaceAll("true&&true", "true")
        string = string.replaceAll("false&&false", "false")
    }

    return string.toBoolean()

}

fun String.replaceAll(replaceWhat: String, replaceWith: String) = this.replace(Pattern.quote(replaceWhat).toRegex(), replaceWith)